https://www.theregister.co.uk/2018/04/24/skype_yammer_for_windows_phone_killed/
origin - https://www.pipiscrew.com/2018/04/even-microsofts-lost-interest-in-windows-phone-skype-and-yammer-apps-killed/ even-microsofts-lost-interest-in-windows-phone-skype-and-yammer-apps-killed